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Globe valve structure is simple, the valve stem can both rotate and lift the principle of the valve to open or cut off, and to ensure that the valve seal and sealing function. Due to the special kinematic principle of the structure, it also brings about extremely unfavorable consequences on the force acting on the seal on the valve (the necessary vertical pressure between the seal pairs and the relative slip between the seal pairs). Practice has proved that the valve on the seal often open and close only a few times, because of the seal between the scratch caused by leakage. Slight scratches need to be disassembled and repaired, and the serious bruise is scrapped due to damage. Such consequences not only increase the manufacturing cost of the enterprise but also affect the performance of the valve. To solve such problems on the valve seal structure and materials have been tested and improved. â‘ the valve stem on the seal to move to the valve flap (purpose is to force the process, the valve flap on the sealing surface relative to the valve cover on the sealing surface in a static non-slip state). Although this improvement can improve the life of the seal, but because of the valve cover to add a valve cover between the seal makes the structure more complex, lower cost. â‘¡ change the sealing material. In the stem seal conical surfacing anti-scratch good Stellite hard alloy, although this method has achieved good results, but because Stellite alloy costs are too high, on the other hand stem The basic material for the 13Cr martensitic stainless steel, poor weldability, pre-welding to be welded when welding, welding insulation and welding process complex. In addition, to ensure the dimensional accuracy of the stem, but also increase the roughing process. Comprehensive analysis, in addition to special requirements, the program is not good value for money. Practice has proved that to improve the stem cone surface hardness is to improve the life of the valve on the feasible way.